Spiral-drill-grinding machine



June 16, 1925.

H. BRITTINGER SPIRAL DRILL-GRINDING MACHINE Filed May 5, 1923 3 Sheets-Sheet 1 IN VENTOR He Z'nrz'ch Brittz'nyer ATTORNEY June 16, 1925.

H. B RITTINGER SPIRAL DRILL GRINDING MACHINE Filed May 5, 1923 3 Sheets-5111,41; 2

IN VENTOR V jfez'nr-z'ch flrz'tiz'n ger ATTORNEY June 16, 1925.

1,541,920 H. BRITTINGER I I SPIRAL DRILL GRINDING MACHINE Filed May 5, 192:5 a Shets-Sheec 5 Tlq. f

INVENTOR ffe'z 7 uric-h ,Brziiifinyer Patented June 16, 1925.

UNITED STATES PATENT HEINRICH BRITTINGER, or onnnnnaorr, GERMANY.

sPmA -narLL-Gnmnme MACHINE.

3 Application filed my 5,

To all whom it may concern: 1

adapted for the class or grinding machines wherein the grinding wheel bearings are stationary, while the drill holder is moved in such manner that a drill may be ground with correct relief. I

In known constructions, oscillating 'motion of the drillholder is accomplished by means of a single or double oaindisc, while simultaneously the/drill holder spindle is receivingadvancing motion by independent means. In the present invention, both of said motions are produced by one and the 1 same cam disc of special design, resulting in simpler construction and smoother operation of themachinei- Referring to the attached drawingswhich illustrate my invention in connection with a type of grinding machine wherein the twist drillfiisheld in horizontal position,

Fig.1 shows a vertical section taken on line 1 1 of Fig. 2, Fig. 2 1s a plan :VleTW W113i) top cover taken off, Fig. 3 shows an en l'arged sectional View taken on the same line as Fig. l and is illustrating details of the locking device of the drill holder spindle, Fig. 41 shows a vertical section on line 1- 1 of Fig. 2, Fig. 5 and Fig. 6 show plan views of the drill holder or casing in different working positions, Fig. 6 in particular is showinga positlon of: grinding with 1n-. creased'relief, Fig.7 1s a horizontal sectlonal cut showing a spring control for the drill: holder, Fig. 8 shows an enlarged section ofa part of the machine within a plane through the axis of the drill holder spindle;

Fig. 9 shows a section within a vertical plane to'the axis of the drill holder-on line a b of Fig. 8. Figs. 10 and 11 are sections online 0 d of Fig. 8, showing control devices for casing 19 and drill holder spindle 10, Fig. 10 corresponding to the working position of the grinder and Fig. 11 correspond ing to the position: in which drills may be 1925. semi o. 636,990.

exchanged. Figs. 12 and 13 respectively are diagrams, showing the action of cou- OFFICE.

pling and uncoupling or releasing the spring control for casing 19, Fig. 12 corresponding to position shown in Fig. 10 and Fig. 13 corresponding. to position shown in Fig. 11, indicating how bolt 24 may slide off the .in clined surfaces 27 and 28 of the respective webs 25 and 26, as will hereafter be more fully explained.

The machine, as shown, may be driven froma shaft 1, (Figs. 1 and 2), a pulley 2 being belted to a pulley 3, which latter may be mounted on a shaft, carrying a grinding wheel 34. A twist drill holder or casing 19, including a drill holder spindle 10, may be operated by means of pulleys 4 and 5, a beltconecting the latter pulleys being kept under tension by idlers 6. A bevel gear 35 being driven by the pulley 5, maydrive a bevel gear 7, the latter being connected by a vertical shaft 36 to a bevel gear 8, which in turn may drive a bevel gear 9, the latter being mounted loosely on a drill holder spindle 10. The gear 9 may have claws 11 at one end, capable of engaging corresponding claws 11 of a cam disc 13, which may be mounted on a sleeve 12 (Figs. 1 and 3),

sliding on the latter and driving the drill' holding spindle 10 by means of a key 14 (Fig. ,The other face of cam disc 13 may carry claws 37. By means of levers 15 (Fig. 1), and 16 (Fig. 4), the cam disc T 13may be coupled to gear 9,'the latterthus driving the drill holding spindle 10. Said cam disc 13 (Fig. 4),may have one or more cams, but with the arrangement. herein shown andforstandard twist drills, two

are required. Against said cam disc rests one end of a bolt. 17 (Figs. 4 to 6), the latter preferably having a roller at eachfend; the otherend of the bolt may bear against a stationary: part [32, the latter having a sliding surface 39 along which said bolt may slide. Said part 32 may be arranged ad- 'justable so that the angle formed by the surface 39 with the center line of the pin can be changed. An angular lever 18 may have two arms, one of said arms being connected by a link {L0 to the bolt 17 while the other one of said arms may bear against a ring 20, :which latter may be tight on the drill holder spindle. i

ill

Said drill spindle, cam disc, gear wheel 9between claws 37, only a slight turn of the and sleeve 12 may, as shown, may all be located within said casing v19, which latter may be mounted oscillatory around the axis of said shaft 36. A spring 21 (Figs. 7 to 11) may control said casing in its working positions, pulling it towards the stationary slide 32, at the same time permitting it to be moved by means of 'the cam disc 13 and bolt 17, or by hand, in opposite direction. Instead of the spring 21, some other means, for instance a weight may be used. Said casing 19 may be provided with a disc shaped extension 25, having a sliding surface 27, which may engage a pin 24, being attached to the spring 21, shown in detail in Figs. 7 to 13. This spring 21 is shown fastened at one end to one end of a tube 22, being located within the latter, said end of said tube being mounted firmly on an extension of the stationary slide 32 in such a manner that the tube 22 may oscillate around saidend. The other loose end of the spring 21,'may be attached to a bolt 23, which latter may move axially or reciprocat-ingly within the tube 22, carrying at its lower side said pin 24-. Solidly connected to the lower part of the stationary slide 32, may be a guiding web 26, Figs. 4; and 7 to 13 having a' sliding surface 28, against which the pin 24: may slide or rest under certain conditions as hereinafter explained. If the casing 19 is in the position shown in full line in Fig. 7, the pin 24 will bear against the sliding surface 27 and under the influence of spring 21 will pull casing 19 towards the slide 32 as far as the bolt 17 will permit, the pin 24; sliding along the stationary web 26. If. however the casing is pulled by hand until the casing is moved into the dotted position shown in Fig. 7 the pin 24: will. automatically slide oil the surface 27 and on to the surface 23 of the stationary web 26 (Figs. 11 to 13), permitting the casing to swing around freely, whereupon the drillmay be exchanged. Tf the casing is pulled back again into working position,pin 24 automatically slides again off the surface 28 and on to the surface 27, whereby the casing 19 again automatically gets under control of spring 21 and of camshaft 13.

A pin 30 (Fig. 3) may be attached to'the casing or hearing for the drill holder spindle, a key 29 being arranged so that it may swing around said pin, being otherwise arranged stationary, said key being under pressure of a spring 38 (Fig. 3). If the key 1s in the dotted position, it engages with claws 37 of cam disc 13 and locks the drill spindle, preventing its rotation. The chuck 33 for the drill can now be loosened or drawn tight and the drill can be exchanged; the casing being in dotted positionshown in:

*Fig; 7. If in a particular position of the drill holder spindle, the key cannot enter spindle will. cause the key to snap into place and to lock the spindle.

Other details of the machine, as supports, hand feed etc. are well. known and are there fore only shown diagrammatically, needing no special explanation.

Tn explaining the particular operation of my device. it is clear, that while the drill holder spindle and cam disc rotate. an oscillating motion of said casing 19. and of the drill holder spindle 10 being located therein, must result. Simultaneously with this oscillating motion. the rotating drill holder spindle performs an advancing motion, the latter being caused through the action of lever 18. This combined.oscillating. rotary and advancing motion of the drill holder spindle, enables to grind the drill point with relief while using stationary grinding wheel. bearings. If the slide 32 is locked in the position shown in Fig. 5, the angle of oscillation of the drill holder or casing is a. if the slide is however locked in posit-ion shown in Fig. (i. the angle of oscillation is 0 plus 6. Tu other words, while the oscillating' motion. being caused through the action of the cam disc, is constant, after being regulated, such regulation is possible by the adjustment of slide 32. As a result the motion of the drill holder spindle may be so controlled that a drill'may be ground with any desired relief.

lVhile my drawings show a horizontal drill. holder spindle, which is preferable, the spindle may be operating at any angle. or may be vertical. The cam disc, as shown, has two cams. but t may have one or more cams, according to the nature oi the drill to be ground. My invention is mainly adapted for twist drill grinding machines having stationary bearings for grinding wheel. but I do not wish to limit my claims to using stationary bearings.

Various modifications may be made in the invention without departing from the spirit thereof and the present exemplitication is to be taken as illustrative and not limitative thereof.

Having thus described my invention, I claim:

1. In a spiral drill grinding machine, a drill holder spindle, mounted rotatably. a cam disc arranged revolvably with said spindle. a stationary slide. means being provided for interconnecting the said parts in such manner. that said cam disc. while revolving with said spindle. simultaneously produces oscillating and reciprocating motion of said spindle.

2. In a spiral drill grinding machine. a drill holder spindle. mounted rotatably. a ram disc arranged revolvably with said spindle. a stationary slide. means being provided for interconnecting the said parts in such manner, that said cam disc, while revolving with said spindle, snnultaneously produces oscillating and reciprocating motion of said spindle, and means for regulating the oscillating motion of said spindle.

3. In a spiral drill grinding machine, a casing, a drill holder spindle, mounted rotatably Within said casing, a cam disc arranged revolvably with said spindle, a stationary slide, means being provided forinterconnecting the said parts in such manner, that said cam disc, while revolving with said spindle, produces oscillating motion of said casing and simultaneously produces oscillating and reciprocating motion of said spindle.

4;. In a spiral drill grinding machine, a casing, a drill holder spindle, mounted rotatably Within said casing, a cam disc arranged revolvably with said spindle, a stationary slide, means being provided for in terconnecting-the said parts in such manner, that said cam disc, while revolving with said spindle, produces oscillating motion of said casing and simultaneously produces oscillating and reciprocating motion of said spindle, and means for regulatingthe oscillating motion of said spindle. V

5. In a spiral drill grinding machine, a cam disc, a drill holder-spindle, and a casing, said disc and said spindle being mounted rotatable within said casing, means producing oscillating motion of said casing and simultaneouslyproducing oscillating and advancing motion of said spindle, said means including said disc, a bolt 17, a slide 32, and a lever 18, substantially as and for the purpose set forth and specified.

6. In a. spiral drill grinding machine, a

cam disc, a drill holder spindle, and a cas-l ing, said disc and said spindle being mounted rotatable withm said casing, means producing osc1llat1ng motion of sald casing and simultaneous-producing oscillating and ad vancing motion of said spindle, said means including said disc, a bolt 17, a slide 32, a web 25 having a sliding surface 27, a web 26 having a sliding surface 28, means for pressing said casing towards said bolt 17 and the latter against said slide 32, and means for automatically uncoupling said casing, substantially as and for the purpose set forth and specified.

7. In a spiral drill grinding machine, a cam disc, claws 37 on said disc, a drill. holder spindle, said disc being arranged to rotate with said spindle, a pin 30 being stationary, a key 29 being arranged to swing around said pin and adapted to enter between said claws if said disc is shifted axially, means being provided for allowing said key to be raised if the same is in such a position that.

it can not enter between said claws if said disc is shifted axially and means whereby said key automatically snaps between said claws it said spindle is slightly turned, substantially as and for the purpose set forth and specified.

8. In a spiral drill grinding machine, a

cam disc, a drill holder spindle, and a casing, said disc and said spindle being mounted rotatable within said casing, means pro ducing oscillating motion of said casing and simultaneously producing oscillating and re ciprocating motion of said spindle, said means including said disc, a bolt 17, a slide 32, the latter being arranged adjustably, a lever 18, and meansfor pressing said disc against said bolt and the latter against said sli e.

HEINRICH BRITTINGER.

Witnesses: C. C. L. B. WYLEs, K. BRINKMANN. 

